Here is what has happened to Kings Canyon in Apex Legends.
UPDATE 15th March 2022: Kings Canyon is back in the map rotation, but it may take some time for it to be updated on your games!
Respawn are constantly making updates to Apex Legends to fix any bugs that may occur as well as adding new content to the game. In Season 12: Defiance, Maggie was the new legend to be introduced to the Games, but it looks like the new Control LTM (Limited Time Mode) brought a whole new player base to the game.

In this 9v9 mode, players have an objective of capturing different points on the map, and the team that controls the points for the longest wins. This mode was in Apex Legends for the first three weeks before it was removed. It will definitely be making a return due to its popularity, but with some improvements. No date has been announced by Respawn as to when it will be released again, but we will let you know as soon as that happens.
Apex Legends – Where is Kings Canyon
Respawn have pushed the 1.91 update today which addressed a few bugs in the game (read more about changes in this patch by clicking here). This seems to have caused a few issues with the servers crashes and many players reporting that they cannot get into the game.
It looks like this issue has been partially solved at the expense of Kings Canyon. Respawn have had to disable the map as it looks like this is the reason players are not able to get into the game. This is temporary until the bug has been fixed and we will keep you updated with the latest on that.
The only maps in rotation at the moment are Olympus and Storms Point!